<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>2子选择器</title>
  <style>
    .nav>a {
      color: red;
    }
  </style>

</head>

<body>
  <div class="nav">
    <a href="#">我是儿子</a>
    <p>
      <a href="#">我是孙子</a>
    </p>
  </div>
</body>

</html>